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25th International Conference on optical Fibre Sensors (OFS)

作者： Le Floch, Sebastien Sauser, Florian Univ Appl Sci Western Switzerland Haute Ecole ARC Ingn Rue Serre 7 CH-2610 St Imier Switzerland

ISBN: (纸本)9781509048502

This paper presents new techniques designed to improve the performances of a BOTDR. The first one introduces a second pump to the sensor, thus doubling the Brillouin signal on the receiver. The second one uses image processing with a two-dimensional Gaussian filter whose parameters are defined. The last technique explores the possibilities offered by colour codes. The benefits of each, in terms of signal-to-noise ratio, is presented by comparing measurements over a distance range of 50km with a spatial resolution of 5m. These techniques can easily be combined and the global improvement is estimated at 10dB, compared to conventional sensors.

关键词： Spontaneous Brillouin scattering distributed fiber sensors optical coding image processing

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Mechanoluminescence: Mechanically Excited Multicolor Luminescence in Lanthanide Ions (Adv. Mater. 7/2019)

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Advanced Materials 2019年第7期31卷

作者： Yangyang Du Yue Jiang Tianying Sun Jianxiong Zhao Bolong Huang Dengfeng Peng Feng Wang Department of Materials Science and Engineering City University of Hong Kong 83 Tat Chee Avenue Hong Kong SAR China City University of Hong Kong Shenzhen Research Institute Shenzhen 518057 China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic Engineering Shenzhen University Shenzhen 518060 China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong SAR China

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Fluorescent Polymer Nanoparticles for Cell Barcoding In Vitro and In Vivo

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SMALL 2017年第38期13卷 2017 Oct;13(38)页

作者： Andreiuk, Bohdan Reisch, Andreas Lindecker, Marion Follain, Gautier Peyrieras, Nadine Goetz, Jacky G. Klymchenko, Andrey S. Univ Strasbourg Fac Pharm UMR CNRS 7213 Lab Biophoton & Pharmacol 74Route RhinBP 60024 F-67401 Illkirch Graffenstaden France Univ Strasbourg FMTS Inserm U1109 MN3TLabEx Medalis F-67000 Strasbourg France CNRS USR3695 BioEmergences Ave Terrasse F-91190 Gif Sur Yvette France

Fluorescent polymer nanoparticles for long-term labeling and tracking of living cells with any desired color code are developed. They are built from biodegradable poly(lactic-co-glycolic acid) polymer loaded with cyanine dyes (DiO, DiI, and DiD) with the help of bulky fluorinated counterions, which minimize aggregation-caused quenching. At the single particle level, these particles are approximate to 20-fold brighter than quantum dots of similar color. Due to their identical 40 nm size and surface properties, these nanoparticles are endocytosed equally well by living cells. Mixing nanoparticles of three colors in different proportions generates a homogeneous RGB (red, green, and blue) barcode in cells, which is transmitted through many cell generations. Cell barcoding is validated on 7 cell lines (HeLa, KB, embryonic kidney (293T), Chinese hamster ovary, rat basophilic leucemia, U97, and D2A1), 13 color codes, and it enables simultaneous tracking of co-cultured barcoded cell populations for > 2 weeks. It is also applied to studying competition among drug-treated cell populations. This technology enabled six-color imaging in vivo for (1) tracking xenografted cancer cells and (2) monitoring morphogenesis after microinjection in zebrafish embryos. In addition to a robust method of multicolor cell labeling and tracking, this work suggests that multiple functions can be co-localized inside cells by combining structurally close nanoparticles carrying different functions.

关键词： dye-loaded polymer nanoparticles fluorescence microscopy long-term cell tacking optical coding zebrafish

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Precise Failure Location and Protection Mechanism in Long-Reach Passive optical Network

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JOURNAL OF LIGHTWAVE TECHNOLOGY 2016年第22期34卷 5175-5182页

作者： Zhang, Shicheng Ji, Wei Li, Xiao Huang, Kangrui Yin, Rui Shandong Univ Sch Informat Sci & Engn Jinan 250100 Shandong Peoples R China

In this paper, optical code domain reflectometer (OCDR) and optical time domain reflectometer (OTDR) are used for centralized monitoring and troubleshooting any fault occurring in the network. It combines the advantages of the OTDR scheme and the optical coding scheme, which can supervise the whole long-reach passive optical network in a cost-effective manner. Network management system in the central office can initialize monitoring, locating failure, and protection process by monitoring information. The scheme can locate the faulty point precisely by OTDR after determining the failed optical fiber link by the optical coding technique. The OTDR precise positioning and protection scheme can be carried out simultaneously, thus saving recovery time. Furthermore, network performance of OCDR and OTDR, recovery time, loss, cost, bit error rate of data signal transmission are also studied. The results obtained prove the feasibility and efficiency of the proposed network, and that it can support high network capacity.

关键词： Long-reach passive optical network (LR-PON) optical coding optical network survivability optical time domain reflectometer (OTDR)

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Signaling Free Localization of Link and Node Failures in an optical Mesh-Tree Network

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JOURNAL OF optical COMMUNICATIONS AND NETWORKING 2016年第4期8卷 263-271页

作者： Li, Xiao Ji, Wei Zhang, Shicheng Huang, Kangrui Shandong Univ Sch Informat Sci & Engn Jinan 250100 Shandong Peoples R China

A monitoring mechanism combining the advantages of a monitoring trails scheme and an optical coding scheme is proposed;the mechanism can be used in a metro-access network. optical encoders are centrally placed in an optical distribution network and at both sides of each remote node, which makes for much simpler installation and smaller management costs. A modified heuristic monitoring trail allocation algorithm is used for monitoring the inner links of the mesh network. The principle of the complete monitoring scheme and various fault scenes are displayed. The results show that the designed monitoring mechanism costs less and is easily scalable. This system can monitor not only the states of fiber links but also nodes in the network to alleviate the false alarm probability. It can also support high network capacity. Moreover, it can take a trade-off of the number of monitors and optical encoders.

关键词： Fiber Bragg gratings Monitoring trails (m-trails) Network survivability optical coding

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Novel Brillouin optical Time-Domain Analyzer for Extreme Sensing Range Using High-Power Flat Frequency-Coded Pump Pulses

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JOURNAL OF LIGHTWAVE TECHNOLOGY 2015年第12期33卷 2623-2627页

作者： Le Floch, Sebastien Sauser, Florian Llera, Miguel Rochat, Etienne Haute Ecole ARC Metrol & Qual Engn Lab CH-2610 St Imier Switzerland Omnisens SA CH-1110 Morges Switzerland

In this paper, we propose a novel Brillouin optical time-domain analysis setup that combines simultaneous Brillouin gain/loss measurements with colour coding. This technique gives the advantage that the pump power can greatly be increased, compared to other coding schemes;thus, increasing the sensing range. A first measurement over a 200-km fiber loop is performed, with a 3-m spatial resolution and an accuracy of +/- 3 MHz (2s) at the end of the sensing fiber. In a second setup, high-power flat pump pulses are generated by applying an arbitrary waveform signal on a frequency shifter;thus, further increasing the performance of the novel Brillouin sensor. To the best of our knowledge, these are the best results obtained with a Brillouin sensor without Raman amplification.

关键词： Brillouin scattering distributed fiber sensors fiber optics sensors optical coding

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Colour cyclic code for Brillouin distributed sensors 24

Colour cyclic code for Brillouin distributed sensors

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24th International Conference on optical Fibre Sensors (OFS)

作者： Le Floch, Sebastien Sauser, Florian Llera, Miguel Rochat, Etienne HE ARC CH-2610 St Imier Switzerland Omnisens SA CH-1110 Morges Switzerland

ISBN: (纸本)9781628418392

For the first time, a colour cyclic coding (CCC) is theoretically and experimentally demonstrated for Brillouin optical time-domain analysis (BOTDA) distributed sensors. Compared to traditional intensity-modulated cyclic codes, the code presents an additional gain of root 2 while keeping the same number of sequences as for a colour coding. A comparison with a standard BOTDA sensor is realized and validates the theoretical coding gain.

关键词： Stimulated Brillouin scattering fiber-optics sensors distributed fiber sensors optical coding

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Can wavefront coding infrared imaging system achieve decoded images approximating to in-focus infrared images?

Can wavefront coding infrared imaging system achieve decoded...

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International Conference on Frontiers in optical Imaging Technology and Applications / International Symposium on Terahertz Technology and Applications / International Symposium on Surface Topography and optical Microscopy

作者： Feng, Bin Zhang, Chengshuo Xu, Baoshu Shi, Zelin Chinese Acad Sci Shenyang Inst Automat Shenyang 110016 Peoples R China Chinese Acad Sci Key Lab Optoelect Informat Proc Shenyang 110016 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

ISBN: (纸本)9781510601680

Artefacts and noise degrade the decoded image of a wavefront coding infrared imaging system, which usually results in the decoded image being inferior to the in-focus infrared image of a conventional infrared imaging system. The previous letter showed that the decoded image fell behind the in-focus infrared image. For comparison, a bar target experiment at temperature of +20 degrees C and two groups of outdoor experiments at temperatures of +28 degrees C and +70 degrees C are respectively conducted. Experimental results prove that a wavefront coding infrared imaging system can achieve the decoded image being approximating to its corresponding in-focus infrared image.

关键词： Wavefront coding optical coding digital decoding infrared imaging athermalization

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Below 100-fs Timing Jitter Seamless Operations in 10-GSample/s 3-bit Photonic Analog-to-Digital Conversion

IEEE PHOTONICS JOURNAL

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IEEE PHOTONICS JOURNAL 2015年第3期7卷

作者： Hasegawa, M. Satoh, T. Nagashima, T. Mendez, M. Konishi, T. Osaka Univ Grad Sch Engn Osaka 5650871 Japan

We experimentally realize seamless operations with below 100-fs timing jitter in a 10-GSample/s 3-bit photonic analog-to-digital converter (ADC) with an input 2.5-GHz sinusoidal electrical signal. To address the energy efficiency, it is necessary to explore some serial approaches to get most operations in a photonic ADC done before serial-to-parallel conversion to save the number of devices. To press forward with the work on subsequent operations after optical sampling in a photonic ADC, we have investigated optical quantization and coding and demonstrated their performances. The experimental results successfully demonstrated seamless operations in a photonic ADC, i.e., sampling, quantization, and coding, while keeping its parallel-configuration-free characteristics and low timing jitter below 100 fs. This demonstration could address the energy efficiency by reduction of the number of devices, including electrical ADCs for subsequent operations after optical sampling in existing high-performance photonic ADCs.

关键词： Photonic analog-to-digital conversion optical sampling optical quantization optical coding SSFS

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The Theoretical Analysis and Design of coding BOTDR System With APD Detector

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IEEE SENSORS JOURNAL 2014年第8期14卷 2626-2632页

作者： Wan, Shengpeng Xiong, Yuhua He, Xingdao Nanchang Hangkong Univ Minist Educ Key Lab Nondestruct Test Nanchang 330063 Peoples R China

The signal-to-noise ratio and the coding gain of Brillouin optical time domain reflectometry system with APD detector are analyzed. In coding distributed optical fiber sensing system, there are a large number of multipath interferences (MPIs), which are proportional to the code length. The random shot noise caused by MPI will be generated before decoding and cannot be eliminated by decoding process. In addition, the shot noise power is proportional to the square of the code length;the thermal noise power increases linearly with the code length, then, the increase of the speed of the coding gain will be decreased with the increase of the code length. When the shot noise is much larger than the thermal noise, the coding gain will not be increased with the increase of the code length, but will maintain a constant value. This conclusion is in contradiction with the traditional conclusion. At the same time, the shot noise depends on the pulsewidth and power, but the thermal noise is independent on the pulsewidth and the power, so there exists an optimum code length for specific system.

关键词： Brillouin scattering distributed optical fiber sensor optical coding

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